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Posted to issues@spark.apache.org by "Ehsan Mohyedin Kermani (JIRA)" <ji...@apache.org> on 2016/03/10 00:04:40 UTC

[jira] [Commented] (SPARK-13788) CholeskyDecomposition has side effects!

    [ https://issues.apache.org/jira/browse/SPARK-13788?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15188263#comment-15188263 ] 

Ehsan Mohyedin Kermani commented on SPARK-13788:
------------------------------------------------

I'm going to send a PR in couple of minutes.

> CholeskyDecomposition has side effects!
> ---------------------------------------
>
>                 Key: SPARK-13788
>                 URL: https://issues.apache.org/jira/browse/SPARK-13788
>             Project: Spark
>          Issue Type: Bug
>          Components: MLlib
>    Affects Versions: 1.6.0
>            Reporter: Ehsan Mohyedin Kermani
>             Fix For: 2.0.0
>
>
> Current CholeskyDecomposition implementation calling from lapack has side effects due to mutating the array A representing the matrix in packed storage format (see http://www.netlib.org/lapack/lug/node123.html ) which should be captured by cloning A first!



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